Self-adjusting liner pump



Nov. 26, 1929.

5. B. sARGi-:NT

SELF ADJUSTING LINER PUMP Filed Sept. 28, 192'? Patented Nov.` 26, 19129 sUMNER-B. SARGENT, or LosANeELEs, cALIFo'RNIA SLF-ADJUSTING LINER PUMP Application led September 28k 1927. Serial No. 222,630.

My invention relates to the art of pumping oil wells and the like, being more particularly a pump barrel and liners therefor.

Due to the fact that pump barrels as used in oil wells are of considerable length, it has been customary to install in a barrel or tube a lining consisting of a series of short, cylindrical sections of cast iron or other suitable material. These sections are designed to be arranged end to end-'and together' form a smooth bore to receive 4he pump piston. The ends of such sections are usually squared oii` and in the event the two ends of any sections are not parallel, thesections become out of line and form an uneven surface at the joints, resulting in leakage and damage to the piston. l

The principal object ofrmy invention is to produce a pump barrel of the class described, including a ser-ies of liners which are fashioned and shaped in such a manner that during the assembling of the pumpv barrel the liners adjust themselves to form a-smooth straight bore for the pump piston.

Other objects and advantages will appear hereinafter from the following description and drawings.

Referring to the drawings, which are for illustrative purposesnonly,

Fig. lis a vertical sectional view of ,a pump barrel embodying a form of my invention. Fig. 2 is an enlarged vertical sectional view of a portion of the device shown in Fig. 1, and

Fig. 3 is a cross-sectional View on line 3-3 of Fig. 2.

More particularly describing the form of my invention shown in the drawings, 10 designates a pump barrel threaded at its upper 40 end to an upper coupling member or collar 11, and threaded at its lower end to a lower coupling member or Collar 12. The coupling members 11 and 12 eXtendinto the barrel 10 and form shoulders or seats 13 and 14 respectively betweenv which a string of liner sections 15 are disposed. It is to be understood that the pressure exerted on the liner sections by the collars is sufhcient to retain the liners in cooperative relation during the pumping operation. v

Each liner section 15 consists of a cylindrical member having a smooth ground inner bore 16 and an outer surface or face of greatest diameter at a point 17 midway its ends, the outer face of each sectionf fromlits greatest diameter being tapered to the respective ends of the section." At its point of greatest external diametereach scction'engages the inner surface of thebarrel 1 in such a manner as to permit a rocking movement of the section in the inner barrel during the as- .Sembling of the barrel as hereinafter described. y i

.One end' 2() of cach section 15 is finished as the section'of the surface of a sphere, the radius of which is half the length of the liner section, or equivalent to the distance from the greatest diameter of the liner section to the end .of such section, as indicated by dotted lines in Fig. 2. The other end 21 of each liner section is reversely finished to its opposite end so as .to coincide in engagement with the end of the next section and the ends 13 and 14 of the collars 11 and 12 respectively are finished to correspond to the ends of the liners.

The pump barrel is assembled in the following manner, as an example the collar l2 is attached to the barrel 10 and the liner scc- -tions 15 are placed upon a mandrel and inserted in the barrel against the end 14 of the collar, which end of the collar it is understood is shaped correspondingly to the end of the liner section engaged thereby.

The collar 11 is then threaded on the barrel 10 with its end 13 engaging the end of the last liner. The collars 11 and 12 are then tightened, Which action draws the liner sections into tight engagement with each other so that the adjacentends fit tightly against each other. By making the liner sections of greatest diameter mid length their ends so as to engage the walls of the barrel solely at that point, and having the ends of the liners spheroidal such liners readilv. align with each other and present a straight unbroken inner surface to receive the piston. After the assembling operation is *completed, as above described, the mandrel is removed and the liners held in place entirely bythe pressure exerted by the collarsl on the i end of the barrel. 1

In tightening the collars as above de- -scribed, `the pressure exerted by the collars on the liners-in Asome cases-springs the barrel and after removal of the mandrel, the liner sections are so out of alignment that the mandrel cannot, be again placed inthe `pipe sections, resulting in the n'ecessityofl repeating the operation of assembling but with liner sections made as above described, such sections, due to the form of construction described, always tend to straighten out in alignment.

While I have vshown the liner sections as having an annular enlargement intermediate their ends, which enlargement tapers inwardly in both directions towards the ends of the section, it is nto be understood that my invention is not limited to such detail of con- -structiolnas any form of enlargement upon which the linersection may pivot or rock comes Within the spirit of my invention.

What I claim is:

1. A linerv pum barrel consisting of a barrel, a string o? liner sections arranged end to end in said barrel and means, on said barrel, engaging the opposite ends of said string of liner sections, each of said liner sections consisting of a. cylindrical member having a single enlarged portion in termeend to end in said barrel and means, on said barrel, en aging the opposite ends of said string of incr sections, each of said-liner sections consisting of a"cylindrical section having its ends spheroidalfin' form, andproend to end in said barrel and means on said barrel engaging the opposite ends of said string of -liner sections, each of said liner sections having a single annular enlarged portion intermediate its' length adapted 'to en age said barrel, and -having its ends pro'- v1 e with a spheroidal surface described about a point on'the longitudinal axis of the liner section coincident with said enlarged portion of the liner.v a

6. In a vliner pump, a barrel, a string of linersections in said barrel, means on each end of the' barrel for engaging the ends of said string, each of said 4liner sections consisting of a cylindrical member having a single .annular enlargement midway its length engaging said barrel and having spheroidal faces at each end, formed on a radius half the length of the section, the s heroidall faces on the ends 0f each section positely disposed.V

7. A liner section sisting of a cylindrical member, having its greater diameter midway its length, and having end faces spheroidal-in form.

In testimony whereof, I have hereunto set my hand' at 22nd dayof September, 1927.

' SUMNER B. SARGENT.

eing opvided with aisingle enlarged portion intermediate its length for engagement with'the wall of said barrel.

4. A liner pum barrel consisting of a barrel, a string o liner sections arranged end to end in said barrel and means, on said barrel, engaging the opposite ends of said string of liner sections, each of said liner sections consisting of a. cylindrical section having its endsV spheroidal in form, and provided with a single, enlarged portion intermediate 4its length for engagement with the Wallof said barrel,-said string engaging `means on said barrel having an end 'correspondingly faced to receive an end of a liner section.

l'5. A liner pump barrel consisting of a barrel, a string of liner sections arranged `Los' Angeles, California, this for pump barrels con-i 

